Add cnrm annotation to merge3 (#2605)

Author: phanimarupaka

internal/util/merge/merge3.go

@@ -18,6 +18,7 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/GoogleContainerTools/kpt/internal/util/attribution"
 	kptfilev1 "github.com/GoogleContainerTools/kpt/pkg/api/kptfile/v1"
 	"sigs.k8s.io/kustomize/kyaml/kio"
 	"sigs.k8s.io/kustomize/kyaml/kio/filters"
@@ -357,7 +358,7 @@ func (*resourceHandler) equals(r1, r2 *yaml.RNode) (bool, error) {
 
 func stripKyamlAnnos(n *yaml.RNode) error {
 	for _, a := range []string{mergeSourceAnnotation, kioutil.PathAnnotation, kioutil.IndexAnnotation,
-		kioutil.LegacyPathAnnotation, kioutil.LegacyIndexAnnotation} {
+		kioutil.LegacyPathAnnotation, kioutil.LegacyIndexAnnotation, attribution.CNRMMetricsAnnotation} {
 		err := n.PipeE(yaml.ClearAnnotation(a))
 		if err != nil {
 			return err

internal/util/update/resource-merge.go

@@ -25,6 +25,7 @@ import (
 	"github.com/GoogleContainerTools/kpt/internal/errors"
 	"github.com/GoogleContainerTools/kpt/internal/pkg"
 	"github.com/GoogleContainerTools/kpt/internal/types"
+	pkgdiff "github.com/GoogleContainerTools/kpt/internal/util/diff"
 	"github.com/GoogleContainerTools/kpt/internal/util/merge"
 	"github.com/GoogleContainerTools/kpt/internal/util/pkgutil"
 	kptfilev1 "github.com/GoogleContainerTools/kpt/pkg/api/kptfile/v1"
@@ -125,7 +126,7 @@ func (u ResourceMergeUpdater) updatePackage(subPkgPath, localPath, updatedPath,
 	// Package deleted from upstream
 	case originalExists && localExists && !updatedExists:
 		// Check the diff. If there are local changes, we keep the subpackage.
-		diff, err := copyutil.Diff(originalPath, localPath)
+		diff, err := pkgdiff.PkgDiff(originalPath, localPath)
 		if err != nil {
 			return errors.E(op, types.UniquePath(localPath), err)
 		}